Winding for dynamo-electric machines.



ILC. SPEGHTL WlNDING-.POR DYNAM ELECTRIC MACHINES.

APPLGTION FILED JLYZG, 1905. 93 l 1 546. Patented Aug. 17. 1909.

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Y Td lljz'fwhom it may concern:

UNITED STATES PATENT. OFFICE.

HANS SPECHT, OE WILKINS'BURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELEC- TRlC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANA.

wmnnire non brunico-ELECTRIC Macnnsms.

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Patented Aug." 17, 1909.

Application filed Jury 26, 1906. Seri-a1 No. 327,884.

Betlknown that I, Hain.vr C. Srn'onr, a lsuhjectof the Emperor of Germany, and a resldent ofWilkinsburgv-in the county of Alleghenyand State of Pennsylvania, have invented' a new and usein Improvement in windings for `,Dynamo--- ectric Machines, of theiollowin is a specification.

,1 Myfinventionmraates to windings for dynamolclectric machines, and has special reierence to asynchronous motor windings.

, The object of my invention. to provide Y `windings `iorlnachines ci the class aboveindifcated that shall he simple in arrangement ndthat shall permit of eilicient andsatisfactory performance ci such. machines at niorethan-one speed. lt v1s a well known fact that more than one operating s eed of an induction motor may be,Ohta-met by varying 'the number ci mag- T- netic poles, but the electrical performance oi suoli machines, as heretofore constructed,

has not. been satisfactory at both high land low speeds, in all cases. The s eed variajtions have' sometimes been o tained by means of several distinct primary windings which were connected to a supply circuit,

vbut with this arrangement a considerable ,amoimt otextra material 1s re lured 'lor the' windings and the motor itsel must be made large for a given capacity in order that the' windings may be properly disposed.

'Ji-According to my present invention, 'i prog'vide va special two-circuit winding for each yphas'elof a motor which may be connected in i sexies for low speeds and in multiple for a eeed substantially twice that obtained when t,

e two circuits are in series. Furthermore,

provide 'an auxiliary winding which is. lfad-a ted to assist the main winding when the venla er number of poles is produced, and

which may or may not be employed according to the' demands of the existing condi- Q -My inventionis illustrated in the accompanying drawing, in which- Ihgure 1 is a diagrammatic' view oi' a single-phase Winding arranged in accordance .therewithand so drawn as to indicate the magnetic poles produced when current is supplied! thereto. Fig. 2 isa diagrammatic l ;.{61115 orV veight ,magnetic poles, .the several,

coils, of which the winding is comprised, being disposed in eighty-four slots.

Referring to Figi 1, the two circuits of the mam winding, when connected in series, are adapted, as shown, to produce eight magnetic poles. One of the circuits A-B produces north pole a, south pole Z), north pole c and south pole f, while the other circuit B-C is adapted to produce -north pole c, south pole d, north pole g, and south pole 7i. When energy is supplied to terminals A-C, the two circuits being connected in series, eight alternating north and south poles are produced. li the two circuits are connected in parallel, energy being supplied to the point B, north pole c, south pole d, north pole g and south pole h will be produced by circuit B-C, and north pole f, south pole e, north pole l) and south pole a will be produced by the circuit A-B, in which the direction of dow oi current is now reversed. It will be noted, therefore, that, instead of having alternate north and south poles, alternate groups of two north poles and two south poles are produced, or, in other words, half as many alternate north and south poles will be produced. An auxiliary winding comprising a single circuit D-B, is adapted to produce south pole 1f-7L, north pole b--c, south pole d-c and north pole f g. In this way, the main winding comprising the circuits A-B and B-C are assisted, when' A, E and I, circuits A- B and B-Q circuits E-F and F-G and circuits l-#J and J-K being respectively connected in series with each other, and terminals C, Gand K being interconnected to form the Y connection. A circuit is continued frm terminal A, .through slots 1, 11, 2, 12', 8 and 13 to'produce north polea;` through conductor t and v'slots 24,' 14p, 23,V -13, 422-` and l2' toproducea,

' south pole f to north pole, the north pole e H-F and L-J correspond to the auxiliary 4B, 53, lil, 54, 45 and 55 to produce a north pole e; through conductor c and slots 66, 56, t 65, 55, 64 and .54 tovproduce a south pole f; and through conductor Z, to terminal B, from which point, circuit is continued through the Windingl section BMC; through slots 22, 3;). 22, 33, 24 and Bl to produce a north pole c; through conductor m and slots 15, 35, 44, 34, 45% and 33 to produce a south pole d; through conductor a and slots Gil, 7l, 65, T5, 66 and 76 to produce u north pole y; and through conductor o and slots 3, 77, 2. 76, l and to produce a north pole li to the terminal When it is desirable to operate the motor at a high speed, energy may be sup )lied to the terminals D, H and L, the terminals A, E and I being,l interconnected, whereupon l the auxiliary circuit-s D--B, H-*F and Ldfl are, respectively, connected in series with the following groups of parallel circuits: I -A and B-C, F-E and P`-G, J-l and J-K. The circuit may be traced through the slots for the circuit D I--A and D- B--C as follows: from terminal D through slots 53 and 77 to produce a north pote; through conductor p and slots ll and 35 to produce a north pole; through conductor g and slots 14 and 7 4 to produce a south pole; through conductor p and slots 56 and 32 to produce a south pole, from which point the circuit is continued to terminal B. From the terminal B, one circuit is completed as already described, to produce a north pole c, a south polo d, a north pole g and a south )ole 7i. Another circuit in parallel with this 1s completed from terminal B, changing the to a south pole, the south pole b to a north pole, and the north pole c to a south pole. It Will be observed that, as before, the multiple circuit windings and the auxiliary winding' act together to l'orm 'l'our alternate north and south poles. Windings for the circuits E-F-G and I-J-K are other phase windings corresponding to the Winding A'--B-'C and the auxiliary winding Winding D--B and, since the disposition of these windings corresponds exactly to that of the Winding; hereinbelore described, I deem it unnecessary to indicate the slots in which the several coils are located.

It will be understood, by those familiar With the art, that the Winding shown and described lmay readily be adapted for vsingle or polyphase motors and that the number of poles, or the number ol slots, may be varied to suit the conditions ol' operation lor which the machine is designed and, consequently, I desire that only such limitations be imposed as are indicated in the appended claims, n

I claim as my invention:

1. In anV induction motor, a relatively slow speed Winding, and an auxiliary winding` adapted to produce a fraction of the numwinding adapted to produce a predctrr mined number of poles when energy is Vsupplied to its terminals, and an auxiliary ind- `ting adapted to produce one-halt' as many poles as the main winding, and havinone end connected to the middle point ol' the main winding, whereby the latter is dividtd into two parallel halves which tend to produce a smaller number of poles when energy is supplied thereto.

4.. A Winding, for induction motors coinprising` a. series of coils arrangt-d to produce a predetermined number of poles and. adapted when connected in multiple circul, to produceone-half as many poles, an an auxiliary Winding permanently connected to (he junction of the two multiple-connected circuits and adapted to produce the lesser number of poles.

5. A main winding for induction motors comprising a plurality of coils which, when connected in series, are arranged to produce a predetermined number of poles in the l'ollowing` sequence: one north pole and anadjacent south pole, a third north pole and u third south pole, a second north pole and a second south pole, and a fourth north polo and a fourth south pole, and an auxiliary -Windin@r connected to the middle oint ol said. main Winding to roduce one-half the number of poles pro( uced by vsaid main Winding when its coils are connected in scries.

6. An induction motor having a main Winding` adapted to produce two different predeterminednumbers of poles, and an auxiliary winding` adapt-ed to produce the smaller number of poles and connected to an intermediate point in said main winding,

4'7. An induction .motor having a main Winding comprising a plurality of groups of coils which produce a predetermined number of poles when connected in series and adapted to produce'half the said number ol" poles when connected in multiple, and an auxiliary winding adapted to act in conjunction with the main winding to produce the smaller number of poles.

8. A two-speed induction motor having a mainl winding for the slower speed, and an auxiliary Winding connected. to the middle point of themain Winding for the higher speed. f

in the Winding,

9. A. multi-speed, polyphase induction motor, each phase of which comprises a main winding for a slow speed, and an auxiliary Winding which is' connected to the middle point of the maiwinding for a higher speed.

l0. A Winding for dynamo-electric machines comprising, in a single circuit, a plurality of groups of coils, each of said groups producing a pair of .adjacent unlike poles, and successive groups in the circuit being arranged in a different order7 as to position in the Winding.

11. A Winding for dynamo-electric inachines comprising, in a single circuit, a plurality of groups of coils, each of said group producing a pair of adjacent unlike poles7 and successive groups in'the circuit being separated, as to osition in the winding, by other groups in tIlie same circuit.

l2. A winding for dynamo-electric inachines comprising7 in a single circuit, a plurality of groups of coils7 each of said groups producing a pair of adjacent unlike poles, and successive groups in the circuit being divided into two sets, adjacent groupsI as to position being from different sets.

13. A Winding for induction motors each phase of which comprises a plurality of coil groupsI each group plroducing two poles, successive groups in t into two sets, adjacent groups, as to position in the Winding, being from different' sets, and, when the two sets are connected in ser ries, each group producing -unlike poles and, when the two sets are connected in multiple, each group producing like poles.

14. A winding for induction motors comp rising a plurality of coils connected in series and arranged in the circuit in the folloW- ing sequence of position to provide a redetermined number of alternate nort yand south poles: coils for one north and an adj acent south pole, coilsfor a third north and an adjacent south pole7 coils for a second north and an adjacent south pole and coils for a fourth north and an adjacent south pole.

In testimony whereof, I h ave hereunto subscribed my name this 24th day of July, 1906.

HANS C. SPECHT.

Witnesses:

WILLIAM T. HnNsLEY, BIRNEY HrNEs,

e circuitv being divided. 

